|John Travolta and Kelly Preston|
The 49-year-old 'Jerry Maguire' star, who will reach the milestone age in October, said she would love to be pregnant again.
Speaking in a television interview with Amanda de Cadenet she revealed expanding her family help her expand her heart.
She said: "I always wanted to have more kids. I feel like I would even have another child, but it might be pushing it. I'm not afraid to love and to love deeply. My kids help me with that.
"They open up your heart so much. There's nothing like the love of a child. It's the greatest thing ever."
Kelly gave birth to her youngest son Benjamin in 2010 and she credits the toddler with helping her to cope with the loss of 16-year-old son Jett, who died after having a seizure on a family holiday in 2009.
The star - who is also a parent to 12-year-old daughter Ella Bleu - spoke about the feeling of loss after Jett's death.
She said: "Nobody should have to lose a child. It's unfathomable. But I'm here to say that you can get through it. You can live again. You can want to live again.
"Everybody grieves in their own way. I felt at times like I was drowning. It felt like a sea of wet blankets.
"And then I just peeled them off, layer by layer, so that I can now say, 'I want to live.' I love life. My life is beautiful and amazing."